The Full Form of HPML is‍ Human Performance Markup Language.

The Human Performance Markup Language (HPML) Development Group (PDG) is developing a SISO Standard for HPML.

HPML is an XML schema-based language intended to cover all meaningful aspects of human performance measurement in various training and operational environments.  The HPML hierarchy enables the representation of both generic concepts (e.g., measurements and assessments) and mission specific concepts (e.g., instances of measurements and instances of assessments) necessary for capturing the experiences associated with human performance and human behavior.  Specifically, HPML is designed to express performance measurement concepts in a format that is both machine and human readable. It enables the explicit combination and transformation of performance data into performance measurements and assessments.  This allows measures to be constructed independent of any specific training or operational system.